Precision optical square instrument
CA 1304574 C · Owner: Gormley, Brendan J. · Inventors: Gormley, Brendan J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A precision optical square instrument for accurately determining lines and planes respectively perpendicular to reference lines and planes comprising a substantially, hollow housing containing a first and second reflecting means arranged at different vertical positions for viewing first and second marker positions outside the housing which are substantially at right angles to each other. The images of the two marker positions are projected onto third reflecting means which is viewed by a user, such that the user can determine when the two marker positions are located perpendicularly by the, alignment of the images viewed in the third reflecting means.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted July 7, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 7, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.